Display assembly and display device

ABSTRACT

Disclosed is a display assembly which comprises a substrate, a plurality of light emitting units, a transistor unit and a capacitor unit corresponding to each of the plurality of light emitting units. Each of the plurality of light emitting units is electrically coupled to the corresponding transistor unit and the capacitor unit, all of which are independently provided on a side of the substrate. A spacing between each of the plurality of light emitting units is at least two times of a first threshold length.

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). PCT/CN2018/077715 on Mar. 1, 2018,the entire contents of which are hereby incorporated by reference.

FIELD OF THE INVENTION

The present invention is related to a display assembly; moreparticularly, a display device comprising the display assembly.

BACKGROUND OF THE INVENTION

As the demand for real-time information rises, the importance ofon-demand data transmission is also increased. Near-eye displays (NED)can be easily incorporated into other devices and can transmit images,colors, texts and/or sound data at any time; therefore, it is a primarychoice for portable information device or on-demand data transmissionpurposes. Near-eye displays are often implemented for military orgovernmental uses in the past. Currently, the near-eye display industryseeks expansion in the consumer sector. Meanwhile, the entertainmentindustry also sees the market potential in near-eye displays; forexample, home entertainment system and gaming software developers havebeen putting effort into research and development of near-eye displays.

Currently, a typical near-eye display includes head-mounted display(HMD), which can project image directly into users' eyes. This type ofdisplay can emulate bigger displays to overcome the shortcomings of thedisplays in mobile devices. The head-mounted display can also be appliedto virtual reality or augmented reality uses.

Near-eye displays can be further categorized into two types: immersivedisplay and see-through display. In virtual reality (VR) environment, animmersive display can be implemented to enable composite images tocompletely cover the visual field of a user. In augmented reality (AR)environment, a see-through display is implemented; and therefore, texts,side notes or images can be overlapped with real images. In the field ofaugmented reality display technology, a transparent panel (implementedvia optical or electro-optical means) is often used in a see-throughdisplay. This enables the user of the near-eye display to see bothvirtual images and real images in the same time.

However, since human eyes cannot focus on objects placed at a very closedistance (for example, when a user is wearing glasses and using amagnify lens as a reading aid, a distance within the range of themagnify lens and the glasses is considered “close distance”); therefore,the near-eye display needs to be calibrated and adjusted to avoid imagebeing out of focus so as to provide a comfortable using experience forthe users. The traditional near-eye displays rely on complex and heavyoptical assembly to adjust the focus of the image; however, sincenear-eye display is usually worn on the user's head, heavier near-eyedisplays oftentimes cannot be accepted by the users.

To overcome the above mentioned shortcomings, if one can enable at leasttwo light beams emitted by at least two separate pixels to intersect andfocus to produce a clear image; heavy optical assembly would no longerbe necessary; furthermore, the manufacturing cost arisen from theoptical assembly would be eliminated.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an advantageousdisplay assembly for a near-eye display for manufacturing a see-throughdisplay device.

In order to achieve the aforementioned purpose, the present inventionprovides a display assembly comprising a substrate; a plurality of lightemitting units; and a transistor unit and a capacitor unit correspondingto each of the light emitting units. Each of the light emitting unitsand the corresponding transistor unit and capacitor unit areindependently provided on a side of the substrate. And each of the lightemitting units is electrically coupled to the corresponding transistorunit and the capacitor unit. A spacing between each of the lightemitting units is at least two times of a first threshold length.

The phrase “independently provided” used in the present invention meansthe plurality of light emitting units only comprises the light emittingbody, but not other parts that would block the light emitting body, suchas transistors, or capacitors . . . etc.

The display assembly in the prior art is an assembly comprised ofpixels. The pixels may respectively comprise a light emitting body, atransistor, a capacitor . . . etc. The transistor and the capacitor maypartially block the light emitting body, causing the light emissionefficiency to decrease. Based on this reason, the light emitting unitsin the present invention are independently provided. Relative to theprior art, the light emitting units of the present invention havegreater light emission efficiency compare to the light emission body ofthe prior art having the same area. As a result, the area of the lightemitting units can be decreased relative to the prior art.

In some embodiments of the present invention, each of the light emittingunits in the display assembly comprises a red light emitter, a greenlight emitter, and a blue light emitter, respectively. In someembodiments of the present invention, the light emitting units in thedisplay assembly comprise one or more light emitting body subunits,respectively; and each of the light emitting body subunits comprises ared light emitting body, a green light emitting body, and a blue lightemitting body.

In some embodiments of the present invention, the light emitting unitsin the display assembly comprise 1 to 6 light emitting body subunits. Insome embodiments of the present invention, the light emitting units inthe display assembly comprise 2 to 4 light emitting body subunits.

In some embodiments of the present invention, the area of each of thelight emitting units in the display assembly is smaller than that of thepixel in the prior art (the smallest is 6.3×6.3 μm²); the areadifference is at least two times or dozens of times. In some embodimentsof the present invention, the area of each of the light emitting bodysubunits in the display assembly is smaller than 1×1 μm².

In some embodiments of the present invention, the spacing between eachof the light emitting units in the display assembly is 2 to 1000 timesof the first threshold length. In some embodiments of the presentinvention, the spacing between each of the light emitting units in thedisplay assembly is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20,25, 50, 100, 150, 200, 250, 300, 400, 500, 600, 700, 800, 900, or 1000times of the first threshold length.

In some embodiments of the present invention, any one of the lightemitting units in the display assembly has a shape of a rectangle, therectangle has a first side and a second side; the first side is smallerthan or equal to the second side, and the first threshold length isequal to the length of the first side.

In some embodiments of the present invention, any one of the lightemitting units in the display assembly has a shape of a circle; thecircle has a diameter, and the first threshold length is equal to thediameter.

In some embodiments of the present invention, any one of the lightemitting units in the display assembly has a shape of a polygon; thepolygon has a symmetry axis, and the first threshold length is equal tothe length of the symmetry axis. In some embodiments of the presentinvention, the polygon is a regular polygon. In some embodiments of thepresent invention, the regular polygon is a regular hexagon.

In some embodiments of the present invention, any one of the lightemitting units in the display assembly has a shape of a rectangle, acircle and/or a polygon, the rectangle has a first side and a secondside, and the first side is smaller than or equal to the second side;the circle has a diameter; the polygon has a symmetry axis; the firstthreshold length is equal to the shortest of the length of the firstside, the diameter, and the symmetry axis.

In some embodiments of the present invention, the substrate is atransparent substrate. In some embodiments of the present invention, thetransparent substrate is a glass substrate.

In some embodiments of the present invention, the transistor unit in thedisplay assembly is a thin film transistor.

In some embodiments of the present invention, the electrical connectionis a metal connection. In some embodiments of the present invention, themetal connection is a conducting connection.

In some embodiments of the present invention, the display assembly is aself-luminous display assembly; in some embodiments of the presentinvention, the self-luminous display assembly comprises active lightsources such as organic light emitting diodes (OLED), micro lightemitting diodes (micro LED), quantum dot light emitter, or laser activelight sources.

In some embodiments of the present invention, the transistor unit in thedisplay assembly is provided between the light emitting units and thesubstrate. In some embodiments of the present invention, the transistorunit in the display assembly and the corresponding light emitting unitsare on a same plane.

In some embodiments of the present invention, the display assemblyfurther comprises one or more sensors.

The present invention further provides a display device; in addition tothe display assembly, the display device further comprises a collimatingassembly; the collimating assembly comprises one or more collimatingunits. Any one of the collimating units has a shape of a circle whichhas a diameter. The diameter is at least two times of a second thresholdlength; the spacing between each of the collimating units is at least400 nm.

In some embodiments of the present invention, each of the diameter ofthe collimating units in the collimating assembly is 2, 3, 4, 5, 6, 7,8, 9, 10, 11, 12, 13, 14, 15, 20, 50, 100, 150, or 200 times of thesecond threshold length.

In some embodiments of the present invention, any one of the lightemitting units in the display device has a shape of a rectangle, therectangle has a first side and a second side; the first side is smallerthan or equal to the second side, and the second threshold length isequal to the length of the first side.

In some embodiments of the present invention, any one of the lightemitting units in the display device has a shape of a circle; the circlehas a diameter, and the second threshold length is equal to thediameter.

In some embodiments of the present invention, any one of the lightemitting units in the display device has a shape of a polygon; thepolygon has a symmetry axis, and the second threshold length is equal tothe length of the symmetry axis. In some embodiments of the presentinvention, the polygon is a regular polygon. In some embodiments of thepresent invention, the regular polygon is a regular hexagon.

In some embodiments of the present invention, the transistor unit in thedisplay device is a thin film transistor.

In some embodiments of the present invention, the display assembly inthe display device is a self-luminous display assembly; in someembodiments of the present invention, the self-luminous display assemblycomprises an active light source such as organic light emitting diode(OLED), micro light emitting diode (micro LED), quantum dot lightemitter, or laser active light source.

In some embodiments of the present invention, the collimating assemblyin the display device is further capable of adjusting a direction of thecollimating light.

In some embodiments of the present invention, any one of the collimatingunits in the display device is a lens or a liquid crystal spatial lightmodulator (LCSLM). In some embodiments of the present invention, thelens is a microlens or a flat metalens. In some embodiments of thepresent invention, the lens is a concave lens or a convex lens.

In some embodiments of the present invention, the microlens serves thefunction of collimating the direction of the emitted light from the atleast one light emitting unit in the display assembly; and re-directingthe at least two collimated light beams to intersect with each other andcreate a focus.

In some embodiments of the present invention, the flat metalens is ametasurface having nanometer scaled bumps which have the function ofrefracting light and changing the direction of the collimated light. Asa result, the flat metalens has a function equivalent to a diopter and afunction of collimating light. The flat metalens comprises multipleareas containing bumps to enable two collimated light beams to intersectand focus. In some embodiments of the present invention, the flatmetalens comprises two separate areas having bumps to enable twocollimated light beams to intersect at different locations, and thuscreating image having multiple depths of field. In some embodiments ofthe present invention, the flat metalens enables at least two collimatedlight beams to intersect at different locations, and thus creating imagehaving multiple depths of field by using a same or a different areahaving bumps.

In some embodiments of the present invention, the liquid crystal spatiallight modulator comprises a plurality of liquid crystal cells; analignment of a liquid crystal within the liquid crystal cells can bemodulated by changing the applied voltage to the liquid crystal cells,such that the light emitting by each of the light emitting units iscollimated and re-directed in a way that at least two collimated lightbeams can intersect with each other and create a focus. In someembodiments of the present invention, the liquid crystal spatial lightmodulator can alter the driving voltage of at least two liquid crystalcells, enabling at least two collimated light beams passing through theat least two liquid crystal cells to intersect with another light beamat different locations, and creating image having multiple depths offield. In some embodiments of the present invention, the liquid crystalspatial light modulator can alter a driving voltage of at least adifferent liquid crystal cell such that at least two collimated lightbeams can intersect at different locations thus creating image havingmultiple depths of field.

In some embodiments of the present invention, the collimating units inthe display device have a curve surface. In some embodiments of thepresent invention, the curve surface in the display device is aspherical surface or an aspherical surface.

In some embodiments of the present invention, the curve surface of thecollimating units in the display device is a portion of a sphericalsurface. The aforementioned spherical surface has a diameter 2, 3, 4, 5,6, 7, 8, 9, 10, 15, 16, 17, 18, 19, or 20 times of the length of any oneof the light emitting units. In some embodiments of the presentinvention, the aforementioned diameter of the spherical surface is 10times of a length of any one of the light emitting units.

In some embodiments of the present invention, the display device is atransparent display or non-transparent display.

In some embodiments of the present invention, the display device is anear-eye display. In some embodiments of the present invention, thedisplay device is a near-eye display capable of producing image havingmultiple depths of field. The display device can project a light on thecollimating assembly via the light emitting units on the self-luminousdisplay assembly, so the light passing through the collimating assemblycan be collimated to form a collimated light. And the direction of thecollimated lights from at least two light emitting units can be alteredso they can intersect at different locations; and an image havingmultiple depths of field can be created.

In accordance with the prevent invention, the following technicaleffects can be achieved:

-   -   1. In the embodiment of the present invention, the light        emitting units and the transistor unit in the display assembly        are provided independently; the light emission efficiency can be        maximized, and the area of the light emitting body subunit can        be reduced to half or even one tenth of the area of the pixel in        the prior art. This feature is advantageous for the transparent        display and near-eye display.    -   2. In the embodiment of the present invention, the collimating        assembly in the display device is provided to be compatible with        the display assembly, which is also advantageous for the        transparent and near-eye display.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic view of the light emitting body with thecorresponding transistor and capacitor of the display assembly of priorart.

FIG. 1B is a schematic view of the light emitting units with thecorresponding transistor unit and capacitor unit of the display assemblyin accordance with an embodiment of the present invention.

FIG. 2A is a schematic view of the light emitting units in accordancewith an embodiment of the present invention.

FIG. 2B is a schematic view of the light emitting units having aplurality of light emitting body subunits in accordance with anembodiment of the present invention.

FIG. 3A is a schematic view of the display assembly in accordance withan embodiment of the present invention.

FIG. 3B is a schematic view of the collimating assembly in accordancewith an embodiment of the present invention.

FIG. 3C is a schematic view of the display assembly and the collimatingassembly in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way ofexample only, with reference to the accompanying drawings.

FIG. 1A illustrates a light emitting body 11, a transistor 12, and acapacitor 13 in a display assembly pixel 1 according to the prior art.When the light emitting body 11, the transistor 12 and the capacitor 13are integrally provided, the light emitting body 11 will be partiallyblocked by the transistor 12 and the capacitor 13.

FIG. 1B illustrates a plurality of light emitting units 21 having acorresponding transistor unit 22 and a capacitor unit 23 of the displayassembly 2 according to an embodiment of the present invention; in whichthe light emitting units 21, the transistor unit 22, and the capacitorunit 23 are independently provided on a side of a substrate 20. Thelight emitting units 21, the transistor unit 22, and the capacitor unit23 are connected to a conductor 24. The light emitting units 21, thetransistor unit 22 and the capacitor unit 23 are on a same plane. Thedotted area in FIG. 1B indicates an area which is corresponsive to pixel1 in FIG. 1A. For the purpose of comparison, relative to the pixel inthe prior art, the light emission efficiency of the light emitting units21 in the display assembly 2 of the present invention is greatlyenhanced; in the meantime, the area of the light emitting units 21 canbe drastically minimized.

FIG. 2A is a schematic view of the light emitting units 21 according toan embodiment of the present invention. In this embodiment, the lightemitting units 21 has a rectangular shape, the rectangular shape has afirst side d1 and second side d2; and the first side d1 is smaller thanor equal to the second side d2. And a spacing L1 between each of thelight emitting units 21 is at least two times of the first side d1(L1≥2d1).

FIG. 2B is a schematic view of the light emitting units 21 according toan embodiment of the present invention, each of the light emitting units21 comprises four light emitting body subunits 25; and each of the lightemitting body subunits 25 comprises a red light (R) emitter, a greenlight (G) emitter, and a blue light (B) emitter. The arrangement ordershown in FIG. 2B is just an example of the embodiment; light emittingunits 21 may comprise different number of the light emitting bodysubunits 25.

FIG. 3A is a schematic view of the display assembly 2 of the displaydevice 4 display assembly 2. The display assembly 2 comprises aplurality of the light emitting units 21; FIG. 3B is a schematic view ofa collimating assembly 3 in the display assembly 2. The collimatingassembly 3 comprises a plurality of collimating units 31, each of thelight emitting units 21 has a corresponding collimating unit 31. FIG. 3Cis a schematic of the combination of FIG. 3A and FIG. 3B. Each diameterof the collimating units 31 is at least two time of a length of thefirst side d1 of the light emitting units 21; and a spacing L2 betweeneach of the collimating units 31 is at least 400 nm.

Although particular embodiments of the present invention have beendescribed in detail for purposes of illustration, various modificationsand enhancements may be made without departing from the spirit and scopeof the present invention. Accordingly, the present invention is not tobe limited except as by the appended claims.

What is claimed is:
 1. A display assembly, comprising: a substrate; aplurality of light emitting units; and a transistor unit and a capacitorunit corresponding to each of the plurality of light emitting units,wherein, each of the plurality of light emitting units and thecorresponding transistor unit and capacitor unit are independentlyprovided on a side of the substrate, and each of the plurality of lightemitting units is electrically coupled to the corresponding transistorunit and the capacitor unit, wherein, a spacing between each of theplurality of light emitting units is at least two times of a firstthreshold length.
 2. The display assembly of claim 1, wherein theplurality of light emitting units has a shape of a rectangle having afirst side and a second side, the first side is smaller than or equal tothe second side, the first threshold length is equal to a length of thefirst side.
 3. The display assembly of claim 1, wherein the plurality oflight emitting units has a shape of a circle having a diameter, thefirst threshold length is equal to a length of the diameter.
 4. Thedisplay assembly of claim 1, wherein the plurality of light emittingunits has a shape of a polygon having a symmetry axis, the firstthreshold length is equal to a length of the symmetry axis.
 5. Thedisplay assembly of claim 1, wherein the plurality of light emittingunits has a shape of a rectangle, a circle, and/or a polygon, therectangle has a first side and a second side, and the first side issmaller than or equal to the second side; the circle has a diameter, thepolygon has a symmetry axis, the first threshold length is equal to theshortest of a length of the first side, a length of the diameter, and alength of the symmetry axis.
 6. The display assembly of claim 1, whereineach of the plurality of light emitting units comprises one or more redlight emitters, green light emitters, or blue light emitters.
 7. Thedisplay assembly of claim 1, wherein each of the plurality of lightemitting units comprises one or more light emitting body subunits, eachof the one or more light emitting body subunits comprises a red lightemitter, a green light emitter, and a blue light emitter.
 8. The displayassembly of claim 7, wherein one of the plurality of light emittingunits comprises one to six light emitting body subunits.
 9. The displayassembly of claim 1, wherein the transistor unit is provided between acorresponding light emitting units and the substrate.
 10. The displayassembly of claim 1, wherein the transistor unit and the correspondinglight emitting units are on a same plane.
 11. The display assembly ofclaim 1, wherein the transistor unit is a thin film transistor.
 12. Thedisplay assembly of claim 1, further comprising an organic lightemitting diode, a micro light emitting diode, a quantum dot lightemitter or a laser active light source.
 13. A display device comprisingthe display assembly of claim 1 and a collimating assembly; wherein thecollimating assembly comprises a plurality of collimating units, theplurality of collimating units has a shape of a circle which has adiameter, the diameter is at least two times of a second thresholdlength, a spacing in between each of the plurality of collimating unitsis at least 400 nm.
 14. The display device of claim 13, wherein theplurality of light emitting units has a shape of a rectangle, therectangle comprises a first side and a second side, and the first sideis smaller than or equal to the second side, and the second thresholdlength is equal to a length of the first side.
 15. The display device ofclaim 13, wherein the plurality of light emitting units has a shape of acircle having a diameter, the second threshold length is equal to alength of the diameter.
 16. The display device of claim 13, wherein theplurality of light emitting units has a shape of a polygonal having asymmetry axis, the second threshold length is equal to a length of thesymmetry axis.
 17. The display device of claim 13, wherein thetransistor unit in the display assembly is a thin film transistor. 18.The display device of claim 13, wherein the display assembly is anorganic light emitting diode, a micro light emitting diode, a quantumdot light emitter or a laser active light source.
 19. The display deviceof claim 13, wherein the collimating assembly further comprises a meansfor changing a direction of a collimating light.
 20. The display deviceof claim 13, wherein the plurality of collimating units is a lens or aliquid crystal spatial light modulator.
 21. The display device of claim20, wherein the lens is a microlens or a flat metalens.
 22. The displaydevice of claim 13, wherein the plurality of collimating units has acurve surface.
 23. The display device of claim 22, wherein the curvesurface is a spherical surface or an aspherical surface.
 24. The displaydevice of claim 13, wherein the display device is a transparent displayor a non-transparent display.
 25. The display device of claim 13,wherein the display device is a near-eye display.